You are not using a standards compliant browser. Because of this you may notice minor glitches in the rendering of this page. Please upgrade to a compliant browser for optimal viewing:
FirefoxInternet Explorer 7Safari (Mac and PC)

Close Listening: How Sound Reveals The InvisibleThe stethoscope seems so simple — a 19th century tool for listening more closely to the human heart or lungs. It also sparked a culture of listening that is transforming the way scientists learn.

After 50-year hunt, science finds pentaquarksData from the Large Hadron Collider (LHC) outside Geneva appears to have proved the existence of particles made of five quarks, solving a 50-year-old puzzle about the building blocks of matter, scientists said on Tuesday.

Why Does Time Exist?Cosmologist Sean Carroll tackles a deceptively simple question: Why does time exist at all? The potential answers point to a surprising view of the nature of the universe, and our place in it.

Niels Bohr: Life Behind the PhysicsNiels Bohr, with his model of the atom, led physics into the quantum era. In the last of this season’s Perimeter Institute public lectures, his grandson Vilhelm will talk about personality and his influences